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87 lines
3.2 KiB
87 lines
3.2 KiB
// Adds compile-time JS functions to augment the CanvasKit interface.
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// Specifically, anything that should only be on the CPU version of canvaskit.
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(function(CanvasKit){
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CanvasKit._extraInitializations = CanvasKit._extraInitializations || [];
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CanvasKit._extraInitializations.push(function() {
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// Takes in an html id or a canvas element
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CanvasKit.MakeSWCanvasSurface = function(idOrElement) {
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var canvas = idOrElement;
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if (canvas.tagName !== 'CANVAS') {
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canvas = document.getElementById(idOrElement);
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if (!canvas) {
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throw 'Canvas with id ' + idOrElement + ' was not found';
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}
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}
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// Maybe better to use clientWidth/height. See:
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// https://webglfundamentals.org/webgl/lessons/webgl-anti-patterns.html
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var surface = CanvasKit.MakeSurface(canvas.width, canvas.height);
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if (surface) {
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surface._canvas = canvas;
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}
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return surface;
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};
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// Don't over-write the MakeCanvasSurface set by gpu.js if it exists.
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if (!CanvasKit.MakeCanvasSurface) {
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CanvasKit.MakeCanvasSurface = CanvasKit.MakeSWCanvasSurface;
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}
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CanvasKit.MakeSurface = function(width, height) {
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/* @dict */
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var imageInfo = {
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'width': width,
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'height': height,
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'colorType': CanvasKit.ColorType.RGBA_8888,
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// Since we are sending these pixels directly into the HTML canvas,
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// (and those pixels are un-premultiplied, i.e. straight r,g,b,a)
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'alphaType': CanvasKit.AlphaType.Unpremul,
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}
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var pixelLen = width * height * 4; // it's 8888, so 4 bytes per pixel
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// Allocate the buffer of pixels to be drawn into.
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var pixelPtr = CanvasKit._malloc(pixelLen);
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var surface = this._getRasterDirectSurface(imageInfo, pixelPtr, width*4);
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if (surface) {
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surface._canvas = null;
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surface._width = width;
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surface._height = height;
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surface._pixelLen = pixelLen;
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surface._pixelPtr = pixelPtr;
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// rasterDirectSurface does not initialize the pixels, so we clear them
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// to transparent black.
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surface.getCanvas().clear(CanvasKit.TRANSPARENT);
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}
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return surface;
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};
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CanvasKit.SkSurface.prototype.flush = function() {
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this._flush();
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// Do we have an HTML canvas to write the pixels to?
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// We will not if this a GPU build or a raster surface, for example.
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if (this._canvas) {
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var pixels = new Uint8ClampedArray(CanvasKit.buffer, this._pixelPtr, this._pixelLen);
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var imageData = new ImageData(pixels, this._width, this._height);
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this._canvas.getContext('2d').putImageData(imageData, 0, 0);
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}
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};
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// Call dispose() instead of delete to clean up the underlying memory
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CanvasKit.SkSurface.prototype.dispose = function() {
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if (this._pixelPtr) {
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CanvasKit._free(this._pixelPtr);
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}
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this.delete();
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}
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CanvasKit.currentContext = CanvasKit.currentContext || function() {
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// no op if this is a cpu-only build.
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};
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CanvasKit.setCurrentContext = CanvasKit.setCurrentContext || function() {
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// no op if this is a cpu-only build.
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};
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});
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}(Module)); // When this file is loaded in, the high level object is "Module";
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